3rdparty source:
- rtaudio: http://sourceforge.net/projects/rtaudio/
- portaudio: http://www.portaudio.com/ 
- comedi: http://comedi.org
- NI-DAQmx http://sine.ni.com/nips/cds/view/p/lang/en/nid/10181
- NI-DAQmx base http://sine.ni.com/nips/cds/view/p/lang/en/nid/14480
